Through Windows Live on your PC – If you have a Games for Windows - LIVE account, you can learn to change your gamertag in Games for Windows - LIVE.

Tips

Not sure what your gamertag is? In the Games Hub on your phone, flick to your Xbox LIVE profile – your gamertag will appear just above your name.

After you've signed in with your Windows Live ID on your phone, you'll need to activate your Xbox LIVE account. Go to the Games hub, then select I already have an Xbox LIVE account and follow the instructions.

To change the Windows Live ID associated with your Xbox LIVE gamertag

On your Xbox 360 console, sign in using your Xbox LIVE gamertag.

Go to Settings, then select Account.

On the Account Management screen, go to Your Information, then select Windows Live ID.

Select Change Windows Live ID and follow the instructions to enter your phone Windows Live ID for your Xbox LIVE account. (This change may take up to 8 hours to show up on your phone.)